Database: Ace Shock Analysis
Event ID: 19981200843
Observation time: 04/30/1998 120.36358 0843 [UT]
|
|
General
Information (About, Top)
| Year |
1998 |
| Fractional day of year |
120.363576 |
| Arrival time of shock [seconds of day] |
31413.0 ± 16.0 |
| Shock type |
FF |
| Electron data availability |
0 |
X GSE location of spacecraft [Re] |
0.036 |
| Y GSE location of spacecraft [Re] |
-0.005 |
| Z GSE location of spacecraft [Re] |
-0.002 |
| Upstream plasma points selected for analysis |
0009 |
| Upstream field points selected for analysis |
0032 |
| Downstream plasma points selected for analysis |
0007
|
| Downstream field points selected for analysis |
0027 |
| Minimum chisq/dof for RH8,RH9,RH10 |
4.43, 11.97, 12.22 |
Event added to database
|
Sat Apr 30 21:42:15 2005
|
Event last processed
|
Wed Oct 15 14:17:16 2014
|
Method selected
|
RH08
|
Propagation delay to Earth [minutes]
|
0.009 ± 0.001
|
Asymptotic
plasma
parameters (About, Top)
|
Parameter
|
Upstream
|
Downstream
|
| Vx GSE [km/s] |
-306.6 ± 2.2 |
-360.6 ± 3.3 |
| Vy GSE [km/s] |
-22.9 ± 3.8 |
-50.7 ± 2.7 |
| Vz GSE [km/s] |
-3.7 ± 2.6 |
33.5 ± 4.9 |
| Wi [km/s] |
14.5 ± 1.2 |
25.6 ± 1.8 |
| We [km/s] |
457.7 ± 36.4 |
808.6 ± 55.6 |
| Ni [n/cc] |
9.0 ± 0.7 |
50.5 ± 2.4 |
| Bx GSE [nT] |
2.2 ± 0.2 |
3.0 ± 0.3 |
| By GSE [nT] |
0.2 ± 0.4 |
-1.5 ± 0.8 |
| Bz GSE [nT] |
0.3 ± 0.2 |
0.7 ± 0.7 |
Plasma Beta
|
0.859 ± 0.776
|
5.765 ± 5.645
|
Sound Speed [km/s]
|
19.10 ± 1.37
|
33.03 ± 2.26
|
Alfven Speed [km/s]
|
16.13 ± 1.35
|
10.82 ± 1.43
|
Best values of
shock
front normal for each method (About, Top)
| Method |
Nx |
Ny |
Nz |
Theta [degrees] |
Phi [degrees] |
| MC |
-0.934 ± 0.093 |
-0.358 ± 0.242 |
-0.005 ± 0.005 |
-0.30 ± 14.39 |
201.00 ± 14.87 |
| VC |
-0.760 ± 0.042 |
-0.389 ± 0.047 |
0.521 ± 0.468 |
31.42 ± 4.40 |
207.11 ± 3.26 |
| MX1 |
-0.867 ± 0.146 |
-0.360 ± 0.245 |
0.344 ± 0.330 |
20.14 ± 19.07 |
202.55 ± 15.91 |
| MX2 |
-0.831 ± 0.098 |
-0.338 ± 0.175 |
0.441 ± 0.410 |
26.19 ± 9.55 |
202.13 ± 11.91 |
| MX3 |
-0.830 ± 0.092 |
-0.320 ± 0.181 |
0.458 ± 0.423 |
27.24 ± 8.05 |
201.08 ± 12.41 |
| RH08 |
-0.939 ± 0.006 |
-0.192 ± 0.013 |
0.285 ± 0.277 |
16.55 ± 1.14 |
191.53 ± 0.77 |
| RH09 |
-0.997 ± 0.005 |
-0.026 ± 0.067 |
-0.073 ± 0.072 |
-4.16 ± 3.66 |
181.50 ± 3.84 |
| RH10 |
-0.997 ± 0.005 |
-0.026 ± 0.067 |
-0.073 ± 0.072 |
-4.16 ± 3.76 |
181.50 ± 3.86 |
| Average |
-0.894 |
-0.251 |
0.237 |
14.114 |
196.051 |
| Median |
-0.867 |
-0.320 |
0.344 |
20.140 |
201.085 |
| Deviation |
0.086 |
0.151 |
0.249 |
14.813 |
9.963 |
Key shock
parameters (About, Top)
| Method |
ThetaBn |
Shock Speed |
Compression |
| MC |
15.9 ± 8.5 |
367.9 ± 5.1 |
5.68 ± 0.56 |
| VC |
41.4 ± 3.4 |
327.2 ± 4.3 |
5.68 ± 0.56 |
| MX1 |
30.2 ± 3.8 |
358.2 ± 4.5 |
5.68 ± 0.56 |
| MX2 |
34.9 ± 3.3 |
347.7 ± 4.3 |
5.68 ± 0.56 |
| MX3 |
35.4 ± 3.2 |
346.8 ± 4.3 |
5.68 ± 0.56 |
| RH08 |
23.2 ± 3.0 |
373.1 ± 4.4 |
5.68 ± 0.56 |
| RH09 |
10.4 ± 4.8 |
370.4 ± 4.5 |
5.68 ± 0.56 |
| RH10 |
10.4 ± 4.8 |
370.4 ± 4.5 |
5.68 ± 0.56 |
| Average |
25.2 |
357.7 |
5.68 |
| Median |
30.2 |
367.9 |
5.68 |
| Deviation |
12.0 |
16.1 |
0.00 |
Upstream wave speeds
and
mach numbers (About, Top)
|
Method
|
dV
|
Slow
|
Intermediate
|
Fast
|
Slow
Mach
|
Fast
Mach
|
| MC |
74.0 ± 1.8 |
14.5 ± 1.0 |
15.5 ± 1.3 |
20.4 ± 1.2 |
5.12 ± 0.46 |
3.64 ± 0.26 |
| VC |
87.7 ± 2.9 |
10.1 ± 0.6 |
12.1 ± 1.0 |
22.9 ± 1.3 |
8.76 ± 0.80 |
3.84 ± 0.31 |
| MX1 |
85.8 ± 2.5 |
12.2 ± 0.8 |
13.9 ± 1.2 |
21.9 ± 1.3 |
7.09 ± 0.63 |
3.93 ± 0.30 |
| MX2 |
87.2 ± 2.7 |
11.3 ± 0.7 |
13.2 ± 1.1 |
22.3 ± 1.3 |
7.76 ± 0.69 |
3.92 ± 0.31 |
| MX3 |
87.2 ± 2.7 |
11.2 ± 0.7 |
13.1 ± 1.1 |
22.4 ± 1.3 |
7.83 ± 0.70 |
3.91 ± 0.31 |
| RH8 |
82.2 ± 2.1 |
13.4 ± 0.9 |
14.8 ± 1.2 |
21.2 ± 1.3 |
6.18 ± 0.52 |
3.90 ± 0.28 |
| RH9 |
64.2 ± 1.5 |
15.3 ± 1.1 |
15.9 ± 1.3 |
19.8 ± 1.3 |
4.22 ± 0.33 |
3.25 ± 0.22 |
| RH10 |
64.2 ± 1.5 |
15.3 ± 1.1 |
15.9 ± 1.3 |
19.8 ± 1.3 |
4.22 ± 0.33 |
3.25 ± 0.22 |
| Average |
79.1 |
12.9 |
14.3 |
21.3 |
6.4 |
3.7 |
| Median |
85.8 |
13.4 |
14.8 |
21.9 |
7.1 |
3.9 |
| Deviation |
10.2 |
2.0 |
1.4 |
1.2 |
1.7 |
0.3 |
Downstream wave speeds
and
mach numbers (About, Top)
|
Method
|
dV
|
Slow
|
Intermediate
|
Fast
|
Slow
Mach
|
Fast
Mach
|
| MC |
13.2 ± 3.9 |
10.4 ± 1.4 |
10.4 ± 1.4 |
33.2 ± 2.3 |
1.30 ± 0.41 |
0.40 ± 0.14 |
| VC |
16.1 ± 3.1 |
7.9 ± 1.0 |
8.1 ± 1.1 |
33.9 ± 2.3 |
2.09 ± 0.59 |
0.48 ± 0.11 |
| MX1 |
15.7 ± 3.2 |
9.2 ± 1.2 |
9.4 ± 1.2 |
33.5 ± 2.3 |
1.74 ± 0.49 |
0.47 ± 0.12 |
| MX2 |
16.1 ± 3.1 |
8.7 ± 1.1 |
8.9 ± 1.2 |
33.7 ± 2.3 |
1.90 ± 0.53 |
0.48 ± 0.12 |
| MX3 |
16.1 ± 3.1 |
8.6 ± 1.1 |
8.8 ± 1.2 |
33.7 ± 2.3 |
1.92 ± 0.53 |
0.49 ± 0.12 |
| RH8 |
15.2 ± 3.2 |
9.8 ± 1.3 |
9.9 ± 1.3 |
33.3 ± 2.3 |
1.58 ± 0.44 |
0.46 ± 0.12 |
| RH9 |
11.9 ± 3.5 |
10.6 ± 1.4 |
10.6 ± 1.4 |
33.1 ± 2.3 |
1.14 ± 0.35 |
0.37 ± 0.12 |
| RH10 |
11.9 ± 3.5 |
10.6 ± 1.4 |
10.6 ± 1.4 |
33.1 ± 2.3 |
1.14 ± 0.35 |
0.37 ± 0.12 |
| Average |
14.5 |
9.5 |
9.6 |
33.4 |
1.6 |
0.4 |
| Median |
15.7 |
9.8 |
9.9 |
33.5 |
1.7 |
0.5 |
| Deviation |
1.9 |
1.0 |
1.0 |
0.3 |
0.4 |
0.1 |
Survey interval (About, Top)
Selected
data (About, Top)
|
Key plasma parameters
|
Velocity
|
Magnetic Field
|
Simple
Methods
(About, Top)
Rankine Chi^2
Contour (About, Top)
Shock
Speed (About, Top)
Theta Bn (About, Top)
Mach Numbers (About, Top)
Page updated Mon Apr 13 08:55:21 2009
Michael L Stevens
(mstevens@cfa.harvard.edu)
| 
